RWC19: 10 Sarries in quarter-final action
Ten Saracens players will be in 2019 Rugby World Cup this weekend.
An England side containing seven Sarries will take on Australia on Saturday. Owen Farrell will captain the side at fly-half while Billy Vunipola and Elliot Daly remain ever-presents.
Koch could come up against Williams and Carré in the semi-final.
Mako Vunipola starts his first match of tournament and is joined in the front row by hooker Jamie George and Maro Itoje is at lock. Fellow second row George Kruis is on the bench.
Wales are back in action on Sunday and face France for a place in the semi-finals. Liam Williams is selected at full-back and Rhys Carré is named as a replacement.
The final last eight-contest sees South Africa play against hosts Japan with Vincent Koch making the Springboks bench.